Freeport, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.5 °F (low) to 73.3 °F (high). Annual precipitation averages 19.6 Inches. Freeport is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.1 °F | 55.3 °F | 3.94 in. |
| February | 41.2 °F | 60.5 °F | 3.97 in. |
| March | 44.2 °F | 65.5 °F | 2.84 in. |
| April | 46.7 °F | 70.7 °F | 1.42 in. |
| May | 51.7 °F | 78.2 °F | 0.75 in. |
| June | 56.1 °F | 85.4 °F | 0.2 in. |
| July | 58.5 °F | 90.0 °F | 0.0 in. |
| August | 58.1 °F | 89.6 °F | 0.03 in. |
| September | 55.8 °F | 86.9 °F | 0.1 in. |
| October | 49.8 °F | 77.6 °F | 0.82 in. |
| November | 42.2 °F | 64.6 °F | 1.86 in. |
| December | 38.4 °F | 55.6 °F | 3.69 in. |
| Annual | 48.5 °F | 73.3 °F | 19.62 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |